JPS58215217A - Manufacture of composite material - Google Patents

Abstract

PURPOSE:To manufacture easily long, good quality composite material by bending a tubular covering material inward so that the outer face becomes inner face, and joining the bent outer face to outer face of a core material. CONSTITUTION:When the rear end 1b of a tubular covering material 1 is pushed mechanically after bringing the tip 1a of the tubular covering material 1 into contact with a die 2, the tubular covering material 1 is bent inward so that outer face of the tip becomes inner face. The tip of a core material 3 is fitted to the tip of the tubular covering material 1 which is bent inward and the tip 1a of the covering material 1 is joined to the tip 3a of the core material 3. Then, by sending mechanically the covering material 1 from left to right and the core material 3 from right to left, a composite material is manufactured.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a composite material.

Conventionally, methods for producing composite materials in which the outer periphery of a core material such as a metal N or metal tube with a circular cross section is coated with other metal materials include the casting method, the coating material is wrapped around the core material, and the coating material is wrapped around the core material, and both sides of the coating material are coated. There are a method of butt welding the end edges, a method of inserting a tubular bank breaking material into a core material, and joining the tubular sheathing material and the core material by rolling or drawing to eliminate any gaps between them.

By the way, in the above casting method, the bonding force of the cladding is weak and the structure is a cast structure, so the workability is poor and uneven thickness and cavities occur during casting, which poses problems in use. Moreover, it had the disadvantage that it did not look good at all.

In addition, in the method of wrapping the sheathing material around the core material and butt-welding both edges of the sheathing material, the adhesion between the sheathing material and the core material is not good, and the appearance of the welded part is not good. The heat-affected zone during welding has disadvantages such as being more brittle than other parts and having poor corrosion resistance.

Furthermore, in the method of inserting the tubular nuclide material into the core material, in order to smoothly insert the tubular branch and root into the core material, the inner circumference of the tubular covering material is set to be larger than the outer circumference of the core material. It is inevitable that there will be a gap between the two.

Therefore, in order to press the inner surface of the tubular covering material to the core material,
It was necessary to seal-weld the ends, remove all the air in the gap between the two, or replace it with inert gas, and then roll it.

Furthermore, the drawing method has the disadvantage that sufficient bonding strength cannot be obtained unless the diameter difference before and after drawing is sufficiently large.
゛Normally, by inserting the entire core material of the tubular covering material and subsequent processing,
In order to press the two joint surfaces together in a good condition, K must have a clean and fine surface texture that is advantageous for the press bonding.

In reality, it is necessary to perform puff polishing using a sandblade of #150 or higher, but it is extremely difficult to clean the inner surface of a long tubular covering material by puff polishing, and if something happens, the inner surface may be scratched. Even the crimping rate was easily overlooked, making it difficult to significantly improve the crimping rate.

The present invention has been developed to solve the drawbacks and problems of each of the conventional methods, and an example of its implementation will be described below with reference to all the drawings.

First, in FIG. 1, ■ is a tubular covering material, and the tip of this tubular covering material 1 is la? After being brought into contact with the die 2, when the rear end 1b of the tubular coating material 1 is mechanically pressed, the tubular coating material 1 is bent inward so that the outer surface of the tip end becomes the inner surface.

As shown in FIG. 2, the distal end of the core material 3 is fitted into the distal end of the tubular sheathing material 1 which has been folded inward and bent, and the distal end 1a of the tubular sheathing material 1 and the core material 3 tip 3a
and fangs, e.g. welded (or mechanically clamped),
After joining each other, the tubular covering material 1 is mechanically fed from left to right, and the core material 3 is mechanically fed from right to left, thereby producing a composite material as shown in FIGS. 3 and 4. be able to.

Incidentally, in the process of manufacturing the composite material shown in FIG. 2, the die 2 does not necessarily have to be used.

In order to achieve good adhesion between the tubular covering material 1 and the core material 3, the inner circumference of the tubular damaged material 1, which has been bent inwardly by the die 2, should be It may be slightly smaller than the outer circumference of.

Furthermore, the core material 3 may be a steel bar with a circular cross section as shown in FIG. 4, or a steel bar with a nearly circular cross section with rounded corners as shown in FIG. As shown, for example, a steel bar with an oval cross section, or as shown in FIG. 7, for example, a seamless steel pipe may be used.

As described above, the present invention involves bending the tubular covering material inward so that its outer surface becomes the inner surface, and then joining the folded outer surface to the outer surface of the core material. As with the core material, it is extremely easy to polish the outer surface of the tubular covering material, clean it, and clean it before processing, and it is also easy to bend the tubular covering material inwardly. By making the inner circumference of the tubular sheathing rM 4A slightly smaller than the outer circumference of the core material in advance, the tubular sheathing material and the core material can be bonded with high overall strength, resulting in a long composite of extremely good quality. The material can be manufactured relatively easily.

[Brief explanation of drawings]

The figures show an example of the implementation of the present invention, in which Fig. 1 is an explanatory diagram showing the inward bending process of the tip of the tubular covering material, and Fig. 2 is an explanatory diagram showing the manufacturing process of the composite material. , Fig. 3 is a vertical cross-sectional view of the manufactured composite material, and Fig. 4 is Fig. 3A.
- The cross-sectional views taken along line A, and FIGS. 5 to 7 are examples of each modification of the manufactured composite material. FIG. Figure 1 Figure 3 Figure 4 A

Claims (1)

[Claims] A method for manufacturing a composite material, which comprises bending the tubular covering material inward so that its outer surface becomes the inner surface, and joining the folded outer surface to the outer surface of a core material.